Extroverts are outgoing and introverts are shy, right? Not necessarily.
Extroversion and introversion describe where people focus and find their energy—outside themselves or inwardly.
Extroverts (or those who have extroverted tendencies) gain energy by being around other people. They recharge in social situations. Often, the more people that are around, the more energised extroverts feel.
On the other hand, introverts often lose energy in social situations and need time alone to recharge their batteries.
Via The Learning Factor